Polyurethane chute liners outperform rubber in zones where fine ore particles slide across the liner surface at shallow angles. The dense, cross-linked PU polymer structure provides excellent resistance to fine-particle grinding abrasion —?the dominant wear mechanism at chute floors, discharge lips, and angled sidewalls. PU typically lasts 2—?× longer than rubber in these sliding abrasion zones.
| Parameter | Specification |
|---|---|
| Base polymer | MDI-based polyurethane (cast) |
| Hardness range | 65—?5 Shore A (application specific) |
| Tensile strength | 35—?5 MPa (varies by hardness) |
| Elongation at break | 350—?50% |
| Abrasion loss (DIN 53516) | 25—?0 mm³ (much better than rubber —?50 mm³) |
| Standard thickness | 15, 20, 25, 30, 40, 50mm |
| Maximum panel size | 1,500 × 1,000mm (larger on request) |
| Fixing method | Adhesive bonding; bolt-on with backing plate; stud insert |
| Temperature range | -20°C to +70°C continuous |
| Chemical resistance | Good —?dilute acids and alkalis |
| Colour options | Yellow (standard), red, black, custom |
| Condition | PU Wins | Rubber Wins |
|---|---|---|
| Impact angle | <45° (sliding) | >60° (high impact) |
| Material size | Fine ore <50mm | Large lump >100mm |
| Moisture | Wet or dry | Dry impact zones |
| Temperature | Up to 70°C | Up to 80°C (NR) |
| Chemical exposure | Dilute acid/alkali | Not recommended for acids |
Most engineered transfer chutes use both rubber and PU in the same chute —?rubber (NR 45A, 60mm) at the impact zone top, transitioning to PU (80A, 25mm) at the sliding ore flow zone bottom. This hybrid approach delivers 40—?0% longer overall liner life vs single-material lining. We design hybrid liner packages —?send your chute drawing for a free zone-by-zone recommendation.
Send us your conveyor dimensions, material type, and capacity. We will provide a detailed specification and competitive price within 24 hours.
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